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    <title>Document</title>
    <script>
        var num = 10;
        num++; // num = num + 1
        console.log(num); // 11
        //1. 前置自增和后置自增如果单独使用效果是一样的
        //2. 后置自增 口诀: 先返回原值 后自加1
        var age = 10;
        console.log(age++ + 10); // 20
    </script>
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